<!DOCTYPE html>
<script type="module">
  let a = self.open()
  let d = await a.navigator.storage.getDirectory()
  let h = await d.getFileHandle("c5c9960b-a637-4232-be3d-3ccc5704852f", {"create": true})
  let r = new ReadableStream({
    start(c) {
      c.enqueue(h)
      c.close();
    }
  });
  let w = await h.createWritable({ })
  r.pipeThrough({"readable": r, "writable": w}, {})
</script>
